Synonyms: Xanthylium, 3,6-bis(ethylamino)-9-(2-(methoxycarbonyl)phenyl)-2,7-dimethyl-, 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-4-(2-(4-sulfophenyl)diazenyl)-1H-pyrazole-3-carboxylate(3-) (3:1);2-Pyrazoline-3-carboxylic acid, 5-oxo-1-(p-sulfophenyl)-4-((p-sulfophenyl)azo)-, compd. with methyl o-(6-(ethylamino)-3-(ethylimino)-2,7-dimethyl-3H-xanthen-9-yl)benzoate (1:3);3,6-Bis(ethylamino)-9-(2-(methoxycarbonyl)phenyl)-2,7-dimethylxanthylium, salt with 4,5-dihydro-5-oxo-1-(4-sulphophenyl)-4-((4-sulphophenyl)azo)-1H-pyrazole-3-carboxylic acid (3:1);Xanthylium, 3,6-bis(ethylamino)-9-(2-(methoxycarbonyl)phenyl)-2,7-dimethyl-, salt with 4,5-dihydro-5-oxo-1-(4-sulfophenyl)-4-((4-sulfophenyl)azo)-1H-pyrazole-3-carboxylic acid (3:1);tris(N-{(3E)-6-(ethylamino)-9-[2-(methoxycarbonyl)phenyl]-2,7-dimethyl-3H-xanthen-3-ylidene}ethanaminium) 5-oxo-1-(4-sulfonatophenyl)-4-[(E)-(4-sulfonatophenyl)diazenyl]-4,5-dihydro-1H-pyrazole-3-carboxylate